Ufo Melika and Pujade-Villar, 2005

Lobato-Vila, Irene, Wang, Yiping, Melika, George, Guo, Rui, Ju, Xiaoxue & Pujade-Villar, Juli, 2021, A Taxonomic Review of the Gall Wasp Genus Saphonecrus Dalla-Torre and Kieffer and other Oak Cynipid Inquilines (Hymenoptera: Cynipidae) from Mainland China, with Updated Keys to Eastern Palaearctic and Oriental Species, Zoological Studies (Zool. Stud.) 60 (10), pp. 1-25 : 20

Genus Ufo Melika and Pujade-Villar, 2005

No new material of Ufo was found in ZAFU, only types of a single species, U. rufiventris Wang, Guo, Wang, Pujade-Villar and Chen, 2016 , and non-type specimens of U. cerroneuroteri Tang and Melika, 2012 that were mentioned in Wang et al. (2016). Currently, only these two species (out of five known species) are known from mainland China. An updated key to the species based on the key given by Melika et al. (2012) is provided.

Key to Ufo species a

1. Notauli complete. Median mesoscutal line present in a form of short triangle posteriorly .................................. U. cerroneuroteri

- Notauli incomplete, extending most to half-length of mesoscutum, very indistinct or even absent in the anterior half. Median mesoscutal line absent ................................................... 2

2. Frons smooth, shining, at most very finely alutaceous .............. 3

- Frons finely coriaceous to microreticulate ................................. 4

3. Head about 2.7–2.8x as wide as long in dorsal view. Radial cell of fore wing above 3.0x as long as wide. Body uniformly reddish brown to black .................................................................. U. abei

- Head about 2.3x as wide as long in dorsal view. Radial cell of fore wing at most 2.5x as long as wide. Body blackish brown to black, metasoma rufous to chestnut ........................ U. rufiventris

4. Lower face with dense white setae. Malar space about 0.5x as long as height of eye. F1 of female antenna 2.0x as long as pedicel .................................................................... U. nipponicus

- Lower face with scattered setae. Malar space above 0.6x as long as height of eye. F1 of female about 1.5x as long as pedicel ........ .................................................................................... U. koreanus

a Based on the key by Melika et al. (2012), here we include U. rufiventris .